Components of Comprehensive Income, Net of Related Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Comprehensive Income (Loss) [Line Items]
Net income	$ 236.1		$ 327.3
Other comprehensive income:
Derivative contracts increase (decrease)	2.1	[1]	(1.0)
Marketable securities (decrease) increase	(0.2)	[1]	0.3
Employee benefit plans increase	14.6	[1]	4.5
Currency translation (losses) gains	(96.0)	[1]	91.3
Net other comprehensive (loss) income	(79.5)		95.1
Comprehensive income	$ 156.6		$ 422.4

[1] All amounts are net of tax. Amounts in parentheses indicate reductions in the AOCI component of stockholders' equity.